<template>
  <div>
    <form class="form-inline" @submit.prevent="onSubmit">
      <div class="input-group mb-2 mr-sm-2">
        <div class="input-group-prepend">
          <div class="input-group-text">任务</div>
        </div>
        <input type="text" class="form-control" placeholder="请填写任务信息" style="width:356px" v-model="taskName">
      </div>

      <button type="submit" class="btn btn-primary mb-2">添加新任务</button>
    </form>
  </div>
</template>

<script>
export default {
  name: "TodoInput",
  emits: ["add"],
  data() {
    return {
      taskName: "",
    }
  },
  methods: {
    onSubmit() {
      if (this.taskName === '') {
        return alert('任务名称不能为空！');
      }
      this.$emit("add", this.taskName);
      this.taskName = '';
    }
  }
}
</script>

<style lang="less" scoped>

</style>